新疆东天山赤龙峰铁矿区石炭纪火山岩特征及其成矿机理研究

发布时间：2018-02-07 09:02

本文关键词： 石炭纪火山岩岩石学特征火山岩型铁矿成矿机理赤龙峰东天山　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：赤龙峰铁矿位于新疆东天山觉罗塔格构造成矿带南缘百灵山矿田一带,该带是新疆重要的铁、铜、金多金属成矿带。百灵山矿田一带因成矿地质条件独特、铁矿资源丰富而备受有关地质工作者的关注。区内已发现成型矿床很多处,如红云滩铁矿、铁岭铁矿、百灵山铁矿、赤龙峰铁矿等,并多伴生有铜矿化等。近年来,众多学者围绕成矿带内多个铁矿开展了大量的地质工作,进行了典型矿床解剖分析并取得了丰硕的成果,认为区域火山作用与成矿作用有密切的关系。本论文在充分收集前人研究资料基础上,结合本人的野外实际工作,综合分析了赤龙峰铁矿区内底坎儿组火山岩地质特征、地球化学特征。并结合区域成矿带内火山作用与成矿作用的关系,对赤龙峰铁矿进行了研究分析,获得了以下主要认识:研究区石炭纪底坎儿组火山岩分布广泛,岩石类型多样。出露岩性主要有玄武岩、安山岩、流纹岩及凝灰岩等,其中以中性、酸性为主,基性岩出露相对较少;岩石组合、岩石地球化学特征显示,火山岩形成于活动大陆边缘的岛弧环境中;火山岩的演化与俯冲板片脱水所引起的地幔部分熔融有密切关系,而岩浆上升过程中的地壳混染起到了很有限的作用。石炭纪火山活动是区内规模最大的构造-岩浆事件,成因上与晚古生代古天山洋的消减-俯冲-碰撞造山过程有关。区域内矿床的形成与这种岩浆-热液活动密切相关,火山深部岩浆系统为矿床的形成提供了成矿物质,火山通道以及火山机构中的一系列破碎带和裂隙带是矿区重要的导矿构造,为含矿流体的运移与扩散提供了通道。赤龙峰铁矿床赋存在石炭纪上统底坎儿组火山岩中,矿体明显受地层控制,呈层状-似层状与地层整合接触。矿石矿物以赤铁矿(镜铁矿)为主,其次为磁铁矿、褐铁矿,脉石矿物主要为绿泥石、石英、方解石、绢云母、黄铁矿等。矿石结构有隐晶-微粒状、叶片状,呈条带状、细脉状、块状、粉末状构造。围岩蚀变主要有绿泥石化、硅化、绢云母化等。通过对矿床地质特征、地球化学特征的分析,并将其与不同成因类型火山岩型铁矿床及区域内其它典型矿床的综合对比分析,认为该矿床的成因类型为海相火山热液-沉积型。通过对区域背景、成矿物质、成矿热液、构造条件等方面的研究,认为研究区深部及外围具有良好的成矿潜力,应该重视深部及外围的找矿。
[Abstract]:Chilongfeng Iron Mine is located in the southern margin of the Bailing Mountain Orefield on the southern margin of the eastern Tianshan Jolatag structural belt in Xinjiang, which is an important iron, copper and gold polymetallic metallogenic belt in Xinjiang. The Baling Mountain Orefield is characterized by unique metallogenic geological conditions. The rich iron ore resources have attracted the attention of the geologists concerned. In the region, many formed deposits have been discovered, such as Hongyuntan iron ore, Tieling iron ore, Bailingshan iron ore, chilongfeng iron ore, etc. In recent years, most of them have been accompanied by copper mineralization. Many scholars have carried out a lot of geological work around a number of iron ores in the metallogenic belt, carried out anatomical analysis of typical deposits and obtained fruitful results. It is considered that regional volcanism is closely related to mineralization. On the basis of fully collecting the previous research data and combining with my field work, the geological characteristics of volcanic rocks of Dikaner formation in Chilongfeng Iron Mine area are comprehensively analyzed in this paper. Geochemical characteristics. Combined with the relationship between volcanism and mineralization in the regional metallogenic belt, the authors have studied and analyzed Chilongfeng iron ore deposit. The main conclusions are as follows: the volcanic rocks of the Carboniferous Dikaner formation are widely distributed in the study area. There are many types of rocks, such as basalt, andesite, rhyolite, tuff and so on. The volcanic rocks are formed in the island arc environment of active continental margin, and the evolution of volcanic rocks is closely related to the partial melting of the mantle caused by the dehydration of subduction plates. The crustal mixing played a very limited role in the process of magma rising. Carboniferous volcanic activity is the largest tectonic-magmatic event in the region. The genesis is related to the subduction-collision orogenic process in the Paleozoic Paleozoic ocean. The formation of the deposits in the area is closely related to the magmatic hydrothermal activity, and the deep volcanic magmatic system provides the ore-forming materials for the formation of the deposits. Volcanic channels and a series of fracture zones and fracture zones in volcanic bodies are important ore-conducting structures in the mining area, which provide a channel for the migration and diffusion of ore-bearing fluids. The Chilongfeng iron deposit occurs in the volcanic rocks of the Upper Carboniferous Dikaner formation in the Carboniferous. The ore body is obviously controlled by stratigraphy and is in contact with stratiform integration. The ore minerals are mainly hematite, magnetite and limonite, and gangue minerals are mainly chlorite, quartz, calcite, sericite, etc, and the ore bodies are dominated by hematite, magnetite and limonite, and gangue minerals are mainly chlorite, quartz, calcite, sericite, etc. Pyrite and so on. The structure of the ore is crypto-granular, leaf flake, strip, veinlike, massive and powdery. The main alteration of surrounding rock is green mud petrification, silicification, sericite, etc. Through the geological characteristics of the deposit, The geochemical characteristics of the deposit are analyzed and compared with the volcanic ore deposits of different genetic types and other typical deposits in the region. It is concluded that the genetic type of the deposit is marine volcanic hydrothermal sedimentary type. Based on the study of ore-forming material, ore-forming hydrothermal solution and structural conditions, it is considered that the deep and outer regions of the study area have good metallogenic potential, and that attention should be paid to the prospecting in the deep and peripheral areas.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P588.14;P618.31

【引证文献】